Power. I don't think there were cheap blue LEDs when these displays first came out, so the backlights were all fluorescent, which was the main power draw in the

Power. I don't think there were cheap blue LEDs when these displays first came out, so the backlights were all fluorescent, which was the main power draw in the display. Once LEDs came along it massively reduced the power consumption of the backlight to where it could be used even in low-power devices.